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FAIR VALUE MEASUREMENTS (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments for contractual obligations $ 10,174 $ 9,840
Derivative Asset, Current 3,689 1,068
Other Assets, Fair Value Disclosure 250 250
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (20) (43)
Assets, Fair Value Disclosure 14,093 11,115
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Preferred stock at end of period 250  
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments for contractual obligations 10,174 9,840
Derivative Asset, Current 0 0
Other Assets, Fair Value Disclosure 0 0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0 0
Assets, Fair Value Disclosure 10,174 9,840
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Preferred stock at end of period 0  
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments for contractual obligations 0 0
Derivative Asset, Current 3,689 1,068
Other Assets, Fair Value Disclosure 0 0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (20) (43)
Assets, Fair Value Disclosure 3,669 1,025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Preferred stock at end of period 0  
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments for contractual obligations 0 0
Derivative Asset, Current 0 0
Other Assets, Fair Value Disclosure 250 250
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0 0
Assets, Fair Value Disclosure 250 $ 250
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Gain (Loss) on Investments 0  
Preferred stock at end of period $ 250